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there are no services with Unix, now you're going to work on a really efficient OS
you need to use server manager.
first check your env variables ORACLE_HOME and ORACLE_SID, as well as your PATH, then :
$> svrmgrl
svrmgrl> startup

check the parameter :
remote_login_passwordfile
if it is defined in your init.ora, it should be = none, else define it like that, and you'll no longer have to enter a password as long as you're connected using a login that belongs to the dba group

your problem is well understood. forget about services, under Unix you have your instance running or not, and it's just a group of processes.
now, to help you with your problem : what is the login you are using, what are the groups your login belongs to ???